Question

小数的巧算41.2*8.1+11*1.25+53.7*1.9的计算过程

Answer 1

41.2*8.1+11*1.25+53.7*1.9

=41.2*(10-1.9)+11*1.25+53.7*1.9

=41.2*10-41.2*1.9+53.7*1.9+11*1.25

=412+12.5*1.9+1.1*12.5

=412+12.5*(1.9+1.1)

=412+12.5*3

=412+37.5

=449.5